Degradation of organics using LaFeO_(3)as a persulfate activator under low-intensity ultra-violet-light irradiation:Catalytic performance and mechanism

作     者：Yumei Li Jian Fan Xiaonan Feng Tao Tao Yumei Li;Jian Fan;Xiaonan Feng;Tao Tao

作者机构：School of EnvironmentHuazhong University of Science and TechnologyWuhan 430074China School of Energy and EnvironmentInner Mongolia University of Science and TechnologyBaotou 014010China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2022年第40卷第7期

页      面：1043-1052页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Project supported by Natural Science Foundation of Inner Mongolia Autonomous Region of China(2019LH02006 2021LHMS04003)。 

主　　题：LaFeO_(3) Peroxydisulfate Singlet oxygen Low-intensity UV-light Rare earths 

摘      要：ABO_(3)-type perovskite oxides with abounding defect structures and diverse physical chemistry attributes have been extensively studied in heterogeneous catalysis.Semiconductor LaFeO_(3)perovskites fabricated via the sol-gel method were used as peroxydisulfate(PDS)activators for methylene blue(MB)degradation under low-intensity ultra-violet(UV)-light to evaluate the degradation efficiency of organic pollutants and mechanism.The results indicate that under low-intensity UV irradiation,the developed UV/LaFeO_(3)/PDS system shows excellent degradation ability of organic pollutants in a wide pH range.Electron spin resonance and radical quenching experiments verify that SO_(4)^(·-),·OH,h^(+)and ^(1)O_(2)are generated during the activation process,and ^(1)O_(2)plays a dominant role in MB degradation.Reduction of low oxidation state Fe(Ⅱ)and O_(2)^(2-)/O^(-)on the LaFeO_(3)surface shows that oxygen vacancy,as the electron transfer mediator,enhances the redox cycle efficiency of Fe(Ⅱ)/Fe(Ⅲ).Photogenerated electrons of LaFeO_(3)involved in the cyclic transformation of Fe(Ⅱ)/Fe(Ⅲ)and PDS activation further increase the number of active radicals and thus promote the synergistic effect of photocatalytic coupled with sulfate radicalbased advanced oxidation processes.